Patent GB-313582-A (GB)
Title: Improvements in or relating to method of and apparatus for pulverizing and treating materials
IPC: B02C19/06
Filed: 1928-09-05
Abstract: 313,582. Erie City Iron Works, (Assignees of Wohlenberg, W. J.). June 16, 1928, [Convention date]. Fuel, feeding.-Coal is pulverized by driving it with gaseous fluid at high velocity and with a continuous movement on to a deflecting wall so that the abrasive effect disintegrates the coal. Coal is fed by a funnel 46 into sealed hoppers 47, 48, supplied with hot air under pressure through pipes 52, 53 respectively, and falls on to a rotating plate 54 from which it is removed by an adjustable scraper 55. A blast of hot air from a pipe 37 meets the falling coal and carries it through a venturi tube 38<a> on to an impact plate 41 from which it passes to a venturi tube 42 to be further disintegrated by an impact plate 44. Further disintegration is provided by the abrading action of walls of a coil 3 and separator 12 and the finely powdered coal is delivered through pipe 14, valve 26, and pipe 18 to the burners 20. The larger particles of coal fall to the bottom of the separator 12 and are carried into the coil 16, which is smaller in cross-section and of smaller diameter than the coil 3 so as to increase the abrading action. The discharge from the coil 16 passes to a pulverizer separator 22 of volute form having an intake 23 and annular impinging walls 24. Discharges 25 in the pulverizer 22, Fig. 2a, are made in the form of narrow slots, which may have guide vanes. These slots increase in width so as to decrease the velocity and increase the pressure of the driving fluid as it passes to the discharge 25 and thence to the pipe 18 to the furnace. The case is made in halves and the width of the slot 25 may be varied by shims between the case halves. The coil 16 and pulverizer 22 may be in duplicate with a common conection to the separator 12. The tubes 16 may be bent into various forms and be of various cross-sections, or the tube may be straight and contain a twisted metal strip. The outlet from the coil 16, Fig. 1, may be connected to another separator 12, the outlet of fine particles from which enter the discharge pipe 18 and the larger particles pass through another coil before entering this discharge pipe. A series of pulverizer units 88, Fig. 15, may be arranged in parallel, the fuel being fed to a common feeding device 89 through pipe 90. The feeding device is provided with three discharge pipes 91 with a separate scraper for delivering the fuel to each pipe. Air is delivered by a pipe 92 through pipes 93 and the discharge pipes 91 lead to venturi tubes 94 leading to the pulverizing units. The preliminary disintegrating units 40, 43, Fig. 1, may be replaced by a disc pulverizer or the fuel feeder may comprise a hopper 67, Fig. 13, provided with breaker rolls 66 fed from a screen 68 which is shaken by a bell-crank 69 through link 71, and crank 72 on a motor shaft 70. A fan 35, Fig. 1, draws hot furnace gases through pipe 32, tubular heater 29, and pipe 34 and discharges them into the boiler through pipes 36. The hot air for the pulverizers is discharged by a fan 27 through the heater into pipe 37.